Buffing-machine.



A. BATES. BUFFING MACHINE.- APPLICATION IILED OUT. 9, 190a.

1,01 3,726.- Patented Jan. 2, 1912.

Fig.1.. 4e

ARTHUR BATES, OF LEICESTER, ENGLAND, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A. CQBIE'QB TION OF NEW JERSEY.

BUFFINGr-MACHINE.

To all whom it may concern:

Be it known that I, ARTHUR BATES, a subject of the King of England, residing at Leicester, in the county of Leicester, England, have invented certain Improvements in Buflingllachines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to bufiing machines and more particularly to machines in which the bufling tool is provided with a removable covering of abrasive material.

The object of the invention is to provide a bufling machine with mechanism for supplying new strips of abrasive material to the buffing tool.

With this object in view the present invention contemplates the provision, in a bufling machine having a bufling tool constructed to receive a removable covering of abrasive material, of means to enable a strip of abrasive material to be applied under tension to the periphery of the tool. By applying the new covering of abrasive material under tension to the periphery of the buffing tool, a more uniform and perfect application of the covering is obtained than would be the case if it were loosely applied to the tool.

In the embodiment of the invention hereinafter described, there is provided a supply strip of abrasive material in the form of a continuous length wound on a rotatable holder which is so arranged that the end of the supply strip may be secured in working position on the buffing tool, and the new covering of abrasive material drawn around its periphery by rotation of said tool. The required tension may be imparted to the supply strip as it is drawn around the buffing tool by the provision of any suitable mechanism for retarding the movement of the strip. This mechanism may comprise a friction device acting on the strip after it leaves the holder, or a tension device acting upon the holder itself, or both the strip and holder may each be acted upon by such a device.

The invention further contemplates the provision of means for accurately determining the length of abrasive material required to form a new cover for the tool, and the provision of means for severing said length Specification of Letters Patent.

Application filed October 9, 19-08.

Patented Jan. 2,1912. Serial No. 456,913.

from the remaining portion of the supply of abrasive material.

Other features of the invention will be hereinafter described in the specification and pointed out in the claims.

In the drawings,Figure 1 is a view in side elevation showing an embodiment of the present invention applied to a bufling machine; Fig. 2 is a front elevation of the upper part of the machine shown in Fig. 1.

In the present embodiment of the invention, the mechanism for supplying new strips of abrasive material to the bufling tool is disclosed as an attachment which is preferably adapted to be applied to existing machines, and is herein shown applied to a buffing machine in which the bufiing tool consists of a rotary wheel.

Referring to the drawings, 2 is the buffing wheel which is mounted in suitable bearings 10 that is attached to the hood 12 of the buffing wheel.

The rotary holder is arranged in the plane of the bufling wheel in order that the supply strip may be conveniently led on to the periphery of the wheel. The spindle 6 is. provided with a spring 14: interposed between the bearing 8 and a nut 16 screwed upon the spindle in order that frictional resistance may be offered to the rotary movement of the holder, so that the necessary tension is imparted to the supply strip as it is applied to the bufling wheel. From the rotary holder the strip of abrasive material passes over a guiding surface 18 which is formed on the bracket 10 and arranged to guide the strip on its way to the bufling wheel to which its end may be secured in the ordinary way.

To assist in maintaining the strip under the requisite tension to cause it to be tight upon the bufling roll and to retain the loose end of the strip in convenient position for handling, there is provided a tension device which is arranged to yieldingly bear upon the strip as it passes over the guiding surface. This device comprises a roller 20 1'0- tatably mounted upon a stud 22 which is secured to one arm 24 of a bell-crank lever carried by a stud 26 that is secured to the bracket 10. The other arm 28 of the bellcrank lever extends into the path of a spring-pressed plunger 30 which is mounted in a recess formed in the bracket 10. The action of the springpressed plunger 30 tends to turn the bell-crank lever upon the stud 2G and thus press the roller 20 against the roughened side of the strip as it passes over the guiding surface 18. The roller 20 is provided with a milled head 32 by which it may be turned by hand so as to feed the strip forward to enable the end of the strip to be applied to the buffing wheel.

To sever the new cover of abrasive material from the remaining portion of the strip, cutting-off mechanism is provided which is preferably carried by the machine. In the machine disclosed, this mechanism comprises a shear block 34 secured to the bracket 10 above the strip of abrasive material, and a knife 36 arranged to cooperate with the shear block to sever the new cover of abrasive material from the remaining portion of the supply strip. The knife 36 is mounted upon a stud 38 carried by the bracket 10 and is provided with a handle 40 by which it can be turned upon the stud so as to lift the knife blade and thus sever the strip. A springpressed plunger 42 is positioned within a recess in the bracketlO and arranged to bear upon the handle of the knife and'thus normally hold the knife in its inoperative position.

In order that the exact length required to cover the buiiing wheel may be severed from the strip of abrasive material, the buffing wheel is provided with an index mark 44 which at one position of the roll registers with a mark 46 upon the frame of the machine. These marks are so arranged that when this registration occurs, such a length will be drawn off from the strip of abrasive material that if the strip is severed by the knife the severed portion will be of the exact length to form a new cover for the buffing wheel. v

In the use of the attachment disclosed, whenever it is desired to apply a new cover of abrasive material to the buffing wheel the old cover is first removed. The tension roller 20 maybe sufficiently rotated by its milled head 32 to move the end of the supply strip beyond the shear blade so that the end of the strip may be secured to the periphery of the buffing wheel in the usual manner. The wheel is then rotated until the index mark 44 is brought into register with the mark 46. This rotation will draw a sui'licient portion of the strip from the supply to form a suitable covering for the buffing wheel, the tension and guiding devices insuring the strip being placed taut the new cover of abrasive material from the remaining portion of the strip. The bufling wheel is then open to receive the second end of the cover which is clamped therein by closing together the two parts of the wheel in the usual manner. As the provision of the tension devices causes the supply strip to be drawn tightly around the periphery of the butiing wheel, it will be seen that the length of strip required to form a new cover for the wheel may be more accurately determined than would be the case if the supply strip were loosely applied to the periphcry of the bufling wheel. In the construction shown it will be observed that only the roller 20 engages the roughened or abrasive side of the supply strip which is of advantage in that it insures that the roughened side of the strip will not be damaged, as might readily be the case if it had engagement with a stationary surface. It will be further observed that by the provision of means for frictionally resisting the rotary movement of the holder for the supply strip, any liability of the strip becoming accidentally uncoiled is effectually prevented.

Having described my invention, what- I claim as new and desire to secure by Letters Patent of the United States is:

1. In a bnfling machine having a rotary cylindrical tool formed to receive a removable covering of abrasive material, a holder supported independently of said cylindrical tool constructed to receive a supply strip of abrasive material and arranged to permit the strip to be led on to the periphery of the tool, and means for retarding the movement of the strip to permit it to be pigllitly drawn around the periphery of the loo.

2. In a bufiing machine in which the butting tool is constructed to receive a removable cover ng of abrasive material, a rotary holder formed to receive a supply strip of abrasive materialarranged to permit a portion of the strip to bedrawn around the perlphery of the butting tool, a member provided wlth a gulding surface arranged to guide the strip on its way to the bufling tool,-

and a spring-pressed roller arranged to yieldingly hold the strip in engagement with said surface and manual means for advanc ing said strip. I

3. In a butting machine, having a cylindrical bufling wheel constructed to receive a removable covering of abrasive material, a rotary holder for a supply roll of abrasive material arranged upon the frame of the machine outside of the buffing wheel and in the planeof the latter.

4. In a bufling machine, having a buffing wheel constructed to receive a removable covering of abrasive material, a rotary holder out-- side the wheel for a supply strip of abrasive material arranged in the plane of the buffing Wheel, a tension device for the strip independent of said wheel and arranged intermediate the holder and wheel, and means for severing a length from said strip.

5. In a buffing machine having a bufling tool constructed to receive a removable covering of abrasive material, a holder for receiving a supply strip of abrasive material arranged so that the strip may be led on to the periphery of the buffing tool, a member having a guiding surface arranged between the holder and tool and a spring-pressed roll-er arranged to engage the roughened side of the strip and hold said strip in engagement with said surface.

6. In a bufling machine, having a buffing tool constructed to receive a removable covering of abrasive material, a holder formed to receive a supply strip of abrasive material and arranged so that the strip may be led on to the periphery of the buffing tool, means for keeping a portion of the strip under tension to facilitate its application to said tool, and means for severing a length from said portion.

7. An attachment for bufling machines, comprising a support adapted to be secured to the frame of a bufling machine, a rotary holder on the support formed to receive a supply strip of abrasive material, said support having a guiding surface arranged to be engaged by the uncoiled portion of the strip, a spring-pressed roller arranged to 'yieldingly hold said portion in engagement With said surface and means for severing a length from said strip.

8. In a bufling machine having a butting Wheel formed to receive a removable covering of abrasive material, a bracket secured to the frame of the machine, a rotary holder for receiving a supply strip of abrasive material arranged on said bracket so that the strip may be led on to the periphery of the buffing wheel, said bracket being provided with a guiding surface arranged in the path of the strip, a spring-pressed roller arranged to hold the strip in engagement with said surface, and means for severing a length from said strip.

9. In a bufling machine having a bufling tool constructed to receive a removable covering of abrasive material, a holder formed to receive a supply strip of abrasive material and arranged so that the strip may be led on to the periphery of the bufiing tool, means for indicating the length of strip required to form a cover for the said periphery and means for severing said length from the remaining portion of the supply strip.

10. In a buffing machine having a buiiing tool constructed to receive a removable covering of abrasive material, a rotary holder for a coiled strip of abrasive material supported independently of the tool and arranged to permit the strip to be drawn around the periphery of the buffing tool, and means separated from said tool for retarding the rotary movement of the holder to enable the strip to be applied under tension to said bufling tool.

11. In a buffing machine having a rotary butling tool constructed to receive a removable covering of abrasive material, a rotary holder for a coiled strip of abrasive material supported independently of the tool and arranged to permit the strip to be drawn around the periphery of the bufling tool, means separated from said tool for retardin g the rotary movement of the holder and a tension device for the strip arranged intermediate the holder and tool.

12. In a buffing machine the combination with a rotary split wheel having positive means for clamping an abrasive cover thereon, a rotary holder for a strip of said material, said holder being arranged to permit said strip to be led to the periphery of said tool, and means for opposing forward movement of said strip while it is being so led.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

ARTHUR BATES.

Witnesses:

GRACE HOLMES, ARTHUR E. J ERVAIS.

Copies of this patent may be obtained for fivecents each, by addressing the Commissioner of Patents, Washington, D. G. 

